首页> 美国卫生研究院文献>Journal of Visualized Experiments : JoVE >Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids

机译:无限制和基于表面活性剂的剪切稀化粘弹性流体中球形颗粒沉降速度的实验测量

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摘要

An experimental study is performed to measure the terminal settling velocities of spherical particles in surfactant based shear thinning viscoelastic (VES) fluids. The measurements are made for particles settling in unbounded fluids and fluids between parallel walls. VES fluids over a wide range of rheological properties are prepared and rheologically characterized. The rheological characterization involves steady shear-viscosity and dynamic oscillatory-shear measurements to quantify the viscous and elastic properties respectively. The settling velocities under unbounded conditions are measured in beakers having diameters at least 25x the diameter of particles. For measuring settling velocities between parallel walls, two experimental cells with different wall spacing are constructed. Spherical particles of varying sizes are gently dropped in the fluids and allowed to settle. The process is recorded with a high resolution video camera and the trajectory of the particle is recorded using image analysis software. Terminal settling velocities are calculated from the data.The impact of elasticity on settling velocity in unbounded fluids is quantified by comparing the experimental settling velocity to the settling velocity calculated by the inelastic drag predictions of Renaud et al.1 Results show that elasticity of fluids can increase or decrease the settling velocity. The magnitude of reduction/increase is a function of the rheological properties of the fluids and properties of particles. Confining walls are observed to cause a retardation effect on settling and the retardation is measured in terms of wall factors.
机译:进行了一项实验研究,以测量基于表面活性剂的剪切稀化粘弹性(VES)流体中球形颗粒的最终沉降速度。测量是针对颗粒在无边界流体和平行壁之间的流体中沉降而进行的。制备了具有广泛流变性质的VES流体并进行了流变学表征。流变学表征包括稳定的剪切粘度和动态的振荡剪切测量,以分别量化粘性和弹性。在直径至少为颗粒直径的25倍的烧杯中测量无边界条件下的沉降速度。为了测量平行壁之间的沉降速度,构建了两个具有不同壁距的实验单元。将大小不同的球形颗粒缓慢滴入流体中,使其沉降。用高分辨率摄像机记录该过程,并使用图像分析软件记录颗粒的轨迹。根据数据计算最终沉降速度,通过将实验沉降速度与通过Renaud等人的无弹性阻力预测计算出的沉降速度进行比较,量化了弹性对无边界流体沉降速度的影响。 1 结果表明,流体的弹性可以增加或减小沉降速度。减少/增加的幅度是流体的流变性质和颗粒性质的函数。观察到限制壁对沉降产生延迟作用,并且根据壁因子来测量延迟。

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